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How to read this list
The word “serial killer” is used carefully. A conviction is identified as a conviction; a confession is identified as a confession; an investigative attribution is not presented as a judicial finding. The Federal Bureau of Investigation (FBI), California Department of Corrections and Rehabilitation (CDCR), and a historical U.S. Department of Justice report do not provide a single statewide ranking or a complete roster. The list therefore uses four practical criteria:
- The case has a documented California connection.
- The record has substantial historical or investigative importance.
- The available source makes the person’s legal or evidentiary status clear.
- Uncertainty is stated instead of being filled with rumor or an unverified victim count.
A period Justice Department report observed, “In California, we have had more than our share of victimization by serial killers.” The sentence is historical context, not a current statistic or a comparative score. That report names Herbert Mullin, Edmund Kemper, the Zodiac Killer, Kenneth Bianchi, Angelo Buono, Juan Corona and Gerald Gallegos. Because this article is limited to nine individuals, Gallegos is noted in the source discussion rather than given a separate profile.
At a glance: nine selected cases
| Case | California record represented here | Evidence status |
|---|---|---|
| Samuel Little | California-linked confessions investigated through the FBI’s ViCAP work | Confessions; only some verified as of 2019 |
| Charles Manson | 1969 Tate-LaBianca killings and separate convictions involving Gary Hinman and Donald Shea | Convictions |
| Zodiac Killer | Five Bay Area murders described by the FBI in 1968–69 | Unresolved identity |
| Richard Ramirez | California murder convictions and condemned incarceration | Convicted; died in custody in 2026 |
| Herbert Mullin | Named in the historical Justice Department serial-crime report | Historical reference; details not established in the retrieved report text |
| Edmund Kemper | Named in the same California serial-crime discussion | Historical reference; details not established in the retrieved report text |
| Kenneth Bianchi | Named in the report’s discussion of serial crimes and information linkage | Historical reference; details not established in the retrieved report text |
| Angelo Buono | Named alongside Bianchi in that historical discussion | Historical reference; details not established in the retrieved report text |
| Juan Corona | Named in the report’s California serial-crime context | Historical reference; details not established in the retrieved report text |
1. Samuel Little: separating confessions from verified cases
The FBI’s October 6, 2019 account says Samuel Little confessed to 93 murders. FBI analysts considered the confessions credible, but the same article states that law enforcement had verified 50 at that time, with additional cases still awaiting confirmation. Those are different numbers: 93 is a confession total, while 50 was the verification figure reported by the FBI in 2019.
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The distinction matters especially in California. The FBI page places California cases among Little’s unmatched confessions. “Unmatched” means investigators had not yet connected the account to a confirmed case when the article was published; it is not a finding that every described killing occurred. The FBI also warned that dates and details in Little’s recollections could be inaccurate.
Little’s case illustrates why victim totals should carry their source and date. A later retelling that simply calls him responsible for 93 murders erases the evidentiary qualification in the FBI record. The agency described its goal in practical terms: “The FBI believes it is important to seek justice for each victim—to close every case possible,” said Christie Palazzolo, a ViCAP crime analyst, in the 2019 article. Read the FBI account at https://www.fbi.gov/news/stories/samuel-little-most-prolific-serial-killer-in-us-history-100619.
2. Charles Manson: a conviction record with separate victim groupings
CDCR’s November 19, 2017 release records that Charles Manson entered state prison for seven counts of first-degree murder and conspiracy to commit murder arising from the August 1969 Tate-LaBianca killings. The same release separately records first-degree murder convictions connected to the July 1969 death of Gary Hinman and the August 1969 death of Donald Shea.
Those entries should not be compressed into one vague claim about a single “Manson murder total.” The agency is distinguishing the Tate-LaBianca charges from the Hinman and Shea convictions. Keeping the groups separate preserves what the official record actually says and avoids implying that every death associated with the Manson family had identical legal treatment.
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CDCR reported that Manson died at a Kern County hospital on November 19, 2017. Its release states: “Inmate Charles Manson, 83, died of natural causes at 8:13 p.m. on Sunday, November 19, 2017, at a Kern County hospital.” The official account is available at https://www.cdcr.ca.gov/news/2017/11/19/inmate-charles-manson-dies-of-natural-causes/.
3. The Zodiac Killer: five known victims, unknown identity
The Zodiac case is the list’s clearest unresolved investigation. An FBI account dated March 2, 2007 describes five people murdered in California’s Bay Area in 1968 and 1969 and says the killer’s identity remains a mystery. The FBI did not open its own murder investigation because the crimes were outside federal jurisdiction, but its personnel assisted local agencies with handwriting, latent-print and cipher analysis.
The killer’s letters and ciphers became part of the investigation’s signature. The FBI account reports that two university professors broke the published code. Solving a cipher did not establish an identity, and no suspect should be presented as conclusively identified on that basis. The five-victim figure belongs to the FBI’s description of known Bay Area murders; it should not be expanded into an unsupported total for every attack historically attributed to the Zodiac.
The original FBI article is archived at https://archives.fbi.gov/archives/news/stories/2007/march/zodiac_030207. The case remains a useful example of the difference between a documented crime series and a solved offender identity.
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4. Richard Ramirez: a condemned sentence and a 2026 death in custody
Richard Ramirez’s status must be described in the present tense of the historical record, not with older language that implies he is still alive. CDCR reported on May 25, 2026 that Ramirez died on May 24, 2026 while incarcerated at California Health Care Facility. The release says he had been serving a condemned sentence.
That announcement did not establish an official medical cause of death. It states that the San Joaquin County Coroner would determine the cause. Consequently, a responsible account can report the date, facility and condemned status, but should not add a cause that the release did not confirm. CDCR’s notice is at https://www.cdcr.ca.gov/news/2026/05/25/condemned-incarcerated-person-richard-ramirez-dies/.
5. Herbert Mullin: a historically cited California case
Herbert Mullin appears in the archived Justice Department Office of Justice Programs report as one of the California serial-crime cases used to discuss the need to connect information across incidents. That establishes his place in the report’s historical subject matter, but the retrieved text does not provide a verified victim count, a charge-by-charge summary or a modern case ranking.
For that reason, this article does not attach a number to Mullin or describe details that the cited report excerpt does not establish. His inclusion signals historical significance in California serial-crime reporting, not a claim that the available source supports a precise comparison with the better-documented cases above.
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6. Edmund Kemper: named in the Justice Department’s historical context
Edmund Kemper is another California offender named by the archived Justice Department report when it discusses serial crimes and the importance of relational criminal information. The report is valuable as period context, but it is not a current database, a statewide census or an objective “most deranged” ranking.
No victim total or legal chronology for Kemper is asserted here beyond that source’s identification. Keeping the description narrow prevents a historical citation from being mistaken for a complete case file.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Kenneth Bianchi: why linked cases require careful attribution
The Justice Department report names Kenneth Bianchi in its discussion of California serial crimes and information linkage. Its inclusion in that discussion does not, by itself, supply all the facts needed to calculate a California victim total or to restate every allegation as a conviction.
Bianchi is therefore presented as a historically cited case, not measured against Little’s confession figure, Manson’s specific convictions or the FBI’s five-victim Zodiac description. Those categories answer different questions and cannot be added together.
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8. Angelo Buono: a separate entry in the same historical record
Angelo Buono is listed separately from Kenneth Bianchi in the archived report. Treating the names as separate entries reflects the report’s wording, while avoiding the unsupported shortcut of assigning one combined number to both men in this article.
The source establishes that Buono was part of the California serial-crime context under discussion; it does not, in the retrieved passage, provide the detailed legal and victim accounting needed for a fuller profile. Readers should not infer that omission is evidence about the underlying case—only that this cited document does not establish those particulars here.
9. Juan Corona: another case in the period overview
Juan Corona is also named in the Justice Department’s historical California overview. As with Mullin, Kemper, Bianchi and Buono, the report’s role here is contextual: it demonstrates the period’s concern with linking information across serial-crime investigations.
No number is assigned to Corona in this article from that source alone. A precise count would require a case-specific record identifying which deaths were legally attributed, which were allegations and what later proceedings established.
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Why the cases cannot be ranked by “derangement”
Clinical diagnosis, criminal responsibility and public notoriety are different categories. The cited records document convictions, investigative work, confessions and unresolved identities; they do not establish a medical scale called “derangement.” A sensational adjective can describe the tone of a headline, but it cannot turn a confession into a verified victim, a cipher into an identification or a historical mention into a complete case record.
Nor can the figures be combined into a league table. Little’s 93 refers to confessions, while the FBI reported 50 verified at the time. Manson’s record separates the Tate-LaBianca convictions from the Hinman and Shea convictions. The Zodiac account identifies five known Bay Area victims while leaving the offender unidentified. Ramirez’s CDCR notice concerns his incarceration and death, not a newly established victim total. The remaining names come from a historical report whose retrieved passage does not provide comparable counts.
What remains unresolved
The Zodiac identity remains unknown in the FBI’s account, and suspected identities should not be presented as settled fact. Little’s California confessions required corroboration, with unmatched cases still distinct from verified victims in the 2019 FBI article. Ramirez’s official cause of death was pending the coroner’s determination in the CDCR release. These are different kinds of uncertainty, but each shows why careful wording matters in historical true crime.
Quick Recap
Sources and further reading
- FBI, “Samuel Little: Confessions of a Killer,” October 6, 2019: https://www.fbi.gov/news/stories/samuel-little-most-prolific-serial-killer-in-us-history-100619
- California Department of Corrections and Rehabilitation, “Inmate Charles Manson Dies of Natural Causes,” November 19, 2017: https://www.cdcr.ca.gov/news/2017/11/19/inmate-charles-manson-dies-of-natural-causes/
- FBI, “The Zodiac Killer,” March 2, 2007: https://archives.fbi.gov/archives/news/stories/2007/march/zodiac_030207
- California Department of Corrections and Rehabilitation, “Condemned Incarcerated Person Richard Ramirez Dies,” May 25, 2026: https://www.cdcr.ca.gov/news/2026/05/25/condemned-incarcerated-person-richard-ramirez-dies/
- U.S. Department of Justice, Office of Justice Programs, archived California relational criminal information report: https://www.ojp.gov/pdffiles1/Digitization/130541NCJRS.pdf
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